共查询到19条相似文献，搜索用时 220 毫秒
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天然气水合物的测井识别和评价 总被引：14，自引：0，他引：14
地球物理测井作为传统的资源评价方法，在天然气水合物勘探中是有效评价手段。从国内外对天然气水合物的研究现状出发，简要地总结了天然气水合物的地球物理特征，介绍了利用电阻率测井和声波速度测井识别含天然气水合物储集层的方法和对天然气水合物进行评价，对现有的测井评价模型进行了讨论，指出了对天然气水合物储集层的地球物理测井评价模型还有待于进一步探讨。 相似文献
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《海洋地质与第四纪地质》2021,41(5)
天然气水合物资源开发的前提条件是准确评价其资源量,而正确理解天然气水合物储层特性是准确评价其资源量的基础。天然气水合物的含量及其赋存形态是影响储层特性的主要因素,赋存形态主要受海洋沉积物的储集的性质与大小控制。储层特征参数直接影响海洋天然气水合物资源评价的准确性。现有天然气水合物资源量评价方法的原理、评价参数及适用性各不相同,且均未考虑水合物的赋存类型。本文在前期工作的基础上,针对天然气水合物有利区块和矿体评价,分别提出了海洋天然气水合物"资源详评"与"资源精评"的新方法。基于小面元的资源详评方法,适用于钻井稀少、地球物理测网较为密集的有利区块孔隙填充型水合物控制地质储量评价;基于"水合物地层丰度"概念的资源精评方法,适用于井网密集的井场小范围矿体探明地质储量精准评价,可有效提高对块状、脉状和结核状等裂隙型填充型水合物资源评价的准确度。 相似文献
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浅表层天然气水合物具有埋藏浅、厚度大、纯度高等特点。现有的评价方法多针对于具有明显BSR反射特征的中深层天然气水合物,而对浅表层天然气水合物的相关研究鲜有发表。本研究通过对国内外浅表层水合物发育区广泛调研,以浅表层水合物的形成机理为基础,探究水合物资源评价方法的选择;以水合物空间展布规律为参考,明确评价范围界定条件;以综合指示特征为参考,分析评价参数的选取依据。并在此基础上,与中深层天然气水合物进行对比,提出浅表层天然气水合物资源刻度区选取及解剖的初步建议,引出评价中存在的问题,梳理出浅表层天然气水合物的资源评价方法的关键问题。 相似文献
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《海洋地质与第四纪地质》2017,(5)
目前,国际上对天然气水合物产状、分布和特征的认识已取得显著进展,开展了一系列陆地多年冻土区和海域天然气水合物试采,但天然气水合物开采仍面临科学挑战。本文在综述全球天然气水合物勘探开发现状的基础上,阐述了天然气水合物储层分类及其开采的地质控制因素,提出了海域天然气水合物有效经济开采面临的资源评价、开采技术方法、储层地质参数和工程地质风险等4方面的科学挑战。要实现海域天然气水合物的有效经济开采,资源评价是基础,开采技术方法是关键。判定天然气水合物储层是否可采需要精确的储层地质参数,能否实现有效开采取决于工程地质风险的控制。 相似文献
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位于南极半岛西侧的别林斯高晋海是南极附近海域天然气水合物成矿的远景区域。利用现有钻孔岩心样品、地震剖面、声波等资料,从气源、稳定域、构造输导及沉积储集等方面,分析了别林斯高晋海天然气水合物的形成条件,预测了天然气水合物成矿远景区,初步探讨了其形成机理,以期能为今后南极半岛区域的天然气水合物资源调查研究提供一定的科学参考依据。 相似文献
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南海天然气水合物的成矿远景 总被引：69，自引：8，他引：69
通过对南海的中新生代区域构造、中上新世纪沉积、近－现代地貌及地温条件的分析，结合ODP184航次钻探成果和水合物最新调查资料，探讨了南海水合物的成矿条件，认为具有良好的成矿地质构造环境；通过对南海陆坡深水区现有大量多道地震调查资料的重新判读，发现南海地区存在多处水合物的地震标志－BSR，以活动边缘笔架增生楔和非活动边缘西沙－东沙为例，重点解剖水合物的地震特征，建立其成藏模式，总结其成矿规律，预测水合物资源远景，为今后在该海域寻找水合物矿床、预测水合物资源远景起到抛砖引玉作用。 相似文献
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南海甲烷水合物资源研究与找矿前景 总被引：9，自引：0，他引：9
甲烷水合物（又称“可燃冰”）可视为一种特定地区内新的烃类资源,是在一定温压条件下,由水与天然气结合形成的一种外观似冰的白色结晶固体,主要存在于下陆架,陆坡和深海浅部深奥层内,据推算,海洋总面积的90％具有水合物形成的温压条件,水合物的总资源量大约相当于全世纪已知煤,石油和天然气总量的2倍,其储量之大,分布面积之,是人类未来不可多得的能源,我国海地区已发现多处水合物地震标志,具有良好的成矿地质构造条件,因此,首选南海重点探区寻找这类矿床,可帮助解决我国未来经济可持续发展所需能源不足的问题。本文通过判读南海深水多道地震调查资料,开展南海重点探区的水合物资源研究,为今后的该海域寻找水合物矿床,建立成藏模式,总顷成矿规律,预测探区的水合物资源远景起到抛砖引玉作用,相信随着深水多频探测,深水浅层高分辨率多地震等高新技术的应用,南海必将成为我国未来海洋水合物发实验室,亦是这门新兴学科的诞生,发展和深化的“摇蓝”。 相似文献
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Preliminary studies of Caspian Sea have shown the possibility of gas hydrate accumulations, because of suitable physicochemical conditions, existence of clayey deposits, and high concentrations of organic matter. Studies have indicated that gas hydrates are mainly composed of methane. Therefore, based on physicochemical equations for methane hydrate stability in different pressure, temperature, and salinity, this study was designed to calculate the potential of gas hydrate formation in the Caspian Sea basin. For this, data of more than 600 locations were analyzed and in each location, upper and lower limits of methane hydrate formation zone were calculated. Then, the zoning maps of upper and lower limits were prepared which can be useful for exploring the gas hydrate as an energy source or predicting gas hydrate hazards. According to the calculations and maps, methane hydrate formation in Caspian Sea, theoretically, can take place from near the seabed to 4000 and 2500 m beneath the sea surface when low and high geothermal gradient are supposed, respectively. By comparing the results with gas hydrate zones revealed in geophysical profiles, it has been shown that, in Caspian Sea, gas hydrates probably accumulate near the lower limit when a high geothermal gradient is assumed. 相似文献
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海洋天然气水合物生成机制的实验研究 总被引：4，自引：1，他引：4
天然气水合物在海洋环境中与在纯水溶液中的生成条件有很大的不同。海洋天然气水合物的生成除了受温度和压力的影响外,还要受到孔隙水的化学组成、流体中气体的浓度及沉积物类型的影响。本文综述了国外海洋天然气水合物的实验研究成果及其进展,重点介绍了海洋天然气水合物生成与分解的热力学条件及各种影响因素,并探讨了今后该领域的研究方向和问题。 相似文献
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天然气水合物甲烷资源量的估算是天然气水合物研究中的热点问题。运用体积法计算含水合物沉积物中的甲烷资源量时,存在参数赋值不确定的问题,从而影响了计算结果的可信度。采用蒙特卡罗法,通过计算样本的频率可以较好地评价和描述计算结果的信度,弥补体积法的不足。对采用蒙特卡罗法估算甲烷资源量的原理进行了分析和探讨,并以麦肯齐三角洲和南海海域水合物为例,计算了水合物赋存区的甲烷资源量。 相似文献
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天然气水合物研究的新进展 总被引：2，自引：1，他引：2
天然气水合物的调查评价刚刚起步，有关其成藏机理等许多问题有待解决。最近国际上关于天然气水合物资源和成藏机理的研究有新的进展，现根据大量的实际调查资料重新估算了天然气水合物资源量，并认为过去报道的资源量过高；海底天然气水合物的聚集与烃流体的垂向运移有关，泥火山底辟构造控制了海底天然气水合物的聚集和分布；天然气水合物的开采方式与常规油气藏开发不同，宜采用简单加热法、抑制剂法和减压法开采；近期应主要进行海底及浅层的天然气水合物勘探。 相似文献
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Gil Young Kim Bo Yeon Yi Dong Geun Yoo Byong Jae Ryu Michael Riedel 《Marine and Petroleum Geology》2011,28(10):1979-1985
The Gas Hydrate Research and Development Organization (GHDO) of Korea successfully accomplished both coring (hydraulic piston and pressure coring) and logging (logging-while-drilling, LWD, and wireline logging) to investigate the presence of gas hydrate during the first deep drilling expedition in the Ulleung Basin, East Sea of Korea (referred to as UBGH1) in 2007. The LWD data from two sites (UBGH1-9, UBGH1-10) showed elevated electrical resistivity (>80 Ω-m) and P-wave velocity (>2000 m/s) values indicating the presence of gas hydrate. During the coring period, the richest gas hydrate accumulation was discovered at these intervals. Based on log data, the occurrence of gas hydrate is primarily controlled by the presence of fractures. The gas hydrate saturation calculated using Archie’s relation shows greater than 60% (as high as ∼90%) of the pore space, although Archie’s equation typically overestimates gas hydrate saturation in near-vertical fractures. The saturation of gas hydrate is also estimated using the modified Biot-Gassmann theory (BGTL) by Lee and Collett (2006). The saturation values estimated rom BGTL are much lower than those calculated from Archie’s equation. Based on log data, the hydrate-bearing sediment section is approximately 70 m (UBGH1-9) to 130 m (UBGH1-10) in thickness at these two sites. This was further directly confirmed by the recovery of gas hydrate samples and pore water freshening collected from deep drilling core during the expedition. LWD data also strongly support the interpretation of the seismic gas hydrate indicators (e.g., vent or chimney structures and bottom-simulating reflectors), which imply the probability of widespread gas hydrate presence in the Ulleung Basin. 相似文献
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M.E. Torres T.S. CollettK.K. Rose J.C. SampleW.F. Agena E.J. Rosenbaum 《Marine and Petroleum Geology》2011,28(2):332-342
The BPXA-DOE-USGS Mount Elbert Gas Hydrate Stratigraphic Test Well was drilled and cored from 606.5 to 760.1 m on the North Slope of Alaska, to evaluate the occurrence, distribution and formation of gas hydrate in sediments below the base of the ice-bearing permafrost. Both the dissolved chloride and the isotopic composition of the water co-vary in the gas hydrate-bearing zones, consistent with gas hydrate dissociation during core recovery, and they provide independent indicators to constrain the zone of gas hydrate occurrence. Analyses of chloride and water isotope data indicate that an observed increase in salinity towards the top of the cored section reflects the presence of residual fluids from ion exclusion during ice formation at the base of the permafrost layer. These salinity changes are the main factor controlling major and minor ion distributions in the Mount Elbert Well. The resulting background chloride can be simulated with a one-dimensional diffusion model, and the results suggest that the ion exclusion at the top of the cored section reflects deepening of the permafrost layer following the last glaciation (∼100 kyr), consistent with published thermal models. Gas hydrate saturation values estimated from dissolved chloride agree with estimates based on logging data when the gas hydrate occupies more than 20% of the pore space; the correlation is less robust at lower saturation values. The highest gas hydrate concentrations at the Mount Elbert Well are clearly associated with coarse-grained sedimentary sections, as expected from theoretical calculations and field observations in marine and other arctic sediment cores. 相似文献